PT-2026-76978

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 154 Firefox ESR versions prior to 115.39 Firefox ESR versions prior to 140.14 Firefox ESR versions prior to 153.1 Thunderbird versions prior to 154 Thunderbird versions prior to 140.14 Thunderbird versions prior to...

PT-2026-77019

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 154 Firefox ESR versions prior to 153.1 Thunderbird versions prior to 154 Thunderbird versions prior to 153.1 Description A site isolation issue exists within the CSS Parsing and Computation component. Site isolation ...

PT-2026-76990

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 154 Firefox ESR versions prior to 140.14 Firefox ESR versions prior to 153.1 Thunderbird versions prior to 154 Thunderbird versions prior to 140.14 Thunderbird versions prior to 153.1 Description A mitigation bypass...

PT-2026-76999

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 154 Firefox ESR versions prior to 153.1 Thunderbird versions prior to 154 Thunderbird versions prior to 153.1 Description An information disclosure issue exists within the Form Autofill component. Recommendations Upda...

Security Vulnerabilities fixed in Thunderbird 140.14 — Mozilla

Internally found bugs present in Thunderbird ESR 140.13, Thunderbird ESR 153.0 and Thunderbird 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. Internally found bugs...

Security Vulnerabilities fixed in Firefox ESR 153.1 — Mozilla

Internally found bugs present in Firefox ESR 140.13, Firefox ESR 153.0 and Firefox 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. Internally found bugs present in...

Security Vulnerabilities fixed in Firefox ESR 115.39 — Mozilla

Internally found bugs present in Firefox ESR 115.38, Firefox ESR 140.13, Firefox ESR 153.0 and Firefox 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited...

Mozilla Firefox ESR < 153.1

The version of Firefox ESR installed on the remote Windows host is prior to 153.1. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-77 advisory. - Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14,...

KLA91225 Multiple vulnerabilities in Mozilla Firefox ESR

Multiple vulnerabilities were found in Mozilla Firefox ESR. Malicious users can exploit these vulnerabilities to bypass security restrictions, cause denial of service, execute arbitrary code, obtain sensitive information. Below is a complete list of vulnerabilities: 1. Security vulnerability can ...

PT-2026-76996

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 154 Firefox ESR versions prior to 140.14 Firefox ESR versions prior to 153.1 Thunderbird versions prior to 154 Thunderbird ESR versions prior to 140.14 Thunderbird ESR versions prior to 153.1 Description A same-origin...

PT-2026-77023

Name of the Vulnerable Software and Affected Versions Firefox ESR version 115.38 Firefox ESR version 140.13 Firefox ESR version 153.0 Firefox version 153 Thunderbird ESR version 140.13 Thunderbird ESR version 153.0 Thunderbird version 153 Description Internal bugs were identified that exhibit...

PT-2026-76991

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 154 Firefox ESR versions prior to 153.1 Thunderbird versions prior to 154 Thunderbird versions prior to 153.1 Description An information disclosure issue exists within the WebRTC component, which is a framework that...

PT-2026-76981

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 154 Firefox ESR versions prior to 115.39 Firefox ESR versions prior to 140.14 Firefox ESR versions prior to 153.1 Thunderbird versions prior to 154 Thunderbird versions prior to 140.14 Thunderbird versions prior to...

PT-2026-76970

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 154 Firefox ESR versions prior to 153.1 Thunderbird versions prior to 154 Thunderbird versions prior to 153.1 Description A use-after-free issue exists in the JavaScript: GC component. Use-after-free is a memory...

PT-2026-76975

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 154 Firefox ESR versions prior to 115.39 Firefox ESR versions prior to 140.14 Firefox ESR versions prior to 153.1 Thunderbird versions prior to 154 Thunderbird versions prior to 140.14 Thunderbird versions prior to...

PT-2026-77017

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 154 Firefox ESR versions prior to 153.1 Thunderbird versions prior to 154 Thunderbird versions prior to 153.1 Description A race condition exists in the JavaScript Engine component. A race condition is a situation whe...

PT-2026-77020

Name of the Vulnerable Software and Affected Versions Firefox ESR version 140.13 Firefox ESR version 153.0 Firefox version 153 Thunderbird ESR version 140.13 Thunderbird ESR version 153.0 Thunderbird version 153 Description Internal bugs were identified that exhibit evidence of memory corruption ...

PT-2026-77016

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 154 Firefox ESR versions prior to 140.14 Firefox ESR versions prior to 153.1 Thunderbird versions prior to 154 Thunderbird ESR versions prior to 140.14 Thunderbird ESR versions prior to 153.1 Description A mitigation...

Mozilla Firefox ESR < 115.39

The version of Firefox ESR installed on the remote Windows host is prior to 115.39. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-75 advisory. - Internally found bugs present in Firefox ESR 115.38, Firefox ESR 140.13, Firefox ESR 153.0 and Firefox 153. Some ...

Mozilla Firefox ESR < 115.39

The version of Firefox ESR installed on the remote macOS or Mac OS X host is prior to 115.39. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-75 advisory. - Internally found bugs present in Firefox ESR 115.38, Firefox ESR 140.13, Firefox ESR 153.0 and Firefox...